Spatial Manager for AutoCAD is a powerful add-on for managing and analyzing spatial data within the AutoCAD environment. While it requires a valid license key, there are free trial and student licensing options available. If you're looking for alternative solutions, there are a range of top options available, including FME, ArcGIS for AutoCAD, and Map 3D. Free and open-source alternatives like QGIS and gdal are also worth considering.